Pei-ying Xue

Northeast Institute of Geography and Agroecology, Beijing, Beijing Shi, China

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Publications (4)6.27 Total impact

  • Pei-Ying Xue, Guo-Xin Li, Quan-Li Zhao
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    ABSTRACT: Cultivation experiments, including short-term copper uptake kinetics, uptake kinetics of Cu by different subcellular fractions and efflux of Cu, were carried out to investigate mechanisms of copper uptake by two species of submerged macrophyte, Hydrilla verticillata (L. f. ) Royle and Myriophyllum spicatum L. The results showed that: (1) Both H. verticillata and M. spicatum showed high influx rates for copper ions with no statistically significant differences [ Vmax (DW) is 2 micromol. (g min) - 1] ; (2) Both leaf and stem Cu concentrations of two strains of plants showed sharp increase with the external medium, and the equilibrium was reached for about 12 h after being exposed to solution with 2 micromol L-1 Cu. Leaves of these two plants accumulated much higher concentrations of Cu than stems. Furthermore, Cu in leaves concentrated predominantly in cell walls ( > 60% ) , followed by soluble and organell fractions; (3) Copper accumulated in cell wall of H. verticillata leaf was considerably higher than that of M. spicatum, and Cu concentrated in intracellular fractions of leaves showed no statistically significant difference between these two plants. Moreover, ability of Cu accumulation and efflux by H. verticillata was higher than that by M. spicatum.
    05/2014; 35(5):1878-83.
  • Pei-ying Xue, Chang-zhou Yan
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    ABSTRACT: Worldwide contamination of arsenic in aquatic systems requires the development of a cost-effective, in situ phytoremediation technology. Hydrilla verticillata (L.f.) Royle, a submerged macrophyte widely distributed throughout the world, has the potential to effectively remove heavy metals from water. In order to understand the potential of H. verticillata for As phytofiltration and its impacts on As cycling in the water system, we investigated As accumulation, speciation and translocation in H. verticillata plants. Plant shoots showed a significant accumulation of As, with a maximum of >700 μg g(-1) dry weight (DW) after exposure to 20 μM arsenate [As(V)] or arsenite [As(III)] for 4d, with no significant differences between the As(V) and As(III) treatments (P>0.05). In addition, results of an in planta transport experiment showed that, after exposure of root and shoot to 2μM As(V) and As(III) for 4d, the bioconcentration factor (BCF) in roots for As(V) was almost twofold than that of As(III). Higher As BCFs in roots compared to shoots was also observed. Arsenic accumulated primarily in the cell walls of root cells (>73% of the total As in roots) and in the soluble parts of leaves (>60% of the total As in leaves). Regardless of the form of As supplied [As(III) or As(V)], As(V) was the dominant form in roots and As(III) was the dominant form in leaves. Further, basipetal translocation of As in this plant (≥17%) was markedly higher than acropetal translocation (≤3%). Because of accumulation of As in the shoot and immobilization of As below ground in roots, H. verticillata is a potential As phytofiltrator for bioremediation.
    Chemosphere 11/2011; 85(7):1176-81. · 3.14 Impact Factor
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    ABSTRACT: Using submerged aquatic plant is a cheap and clean technique to remediate heavy metals in wastewaters. Batch experiments were conducted to assess the biosorption characteristics of Pb (II) ions by fresh tissues of Hydrilla verticallata. The biosorption of Pb(II) was examined for single, binary and ternary solutions at different initial concentrations and different pH values. The experimental results showed that the biosorption capacity increased with increasing pH from 2.0 to 6.0. The biosorption value reached 44.65 mg/g when initial lead concentration was 250 mg/L and pH = 5. Both Cu (II) and Zn(II) ions were found to have an adverse effect on the biosorption of Pb(II) for binary and ternary solutions. In Pb-Cu binary metal solution, when both initial concentrations of lead and copper ions were 250 mg/L, the biosorption capacity for lead ions was decreased to 49.29% of that in single lead ion solution. The biosorption equilibrium data for the Pb-Cu binary metal solution fitted the Langmuir competitive model well (R2 = 0.966). The theoretical q(max) value (58.02 mg/g) was in excellent consistent with that obtained experimentally, and the average relative error between calculated q(e) and experimental q(e) values was only 15.6%. Comparison between biosorption of Pb (II) and Cu (II) by H. verticallata in the binary solution could lead to the conclusion that H. verticallata has no preference of Pb(II) over Cu(II).
    Huan jing ke xue= Huanjing kexue / [bian ji, Zhongguo ke xue yuan huan jing ke xue wei yuan hui "Huan jing ke xue" bian ji wei yuan hui.] 03/2011; 32(3):766-72.
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    ABSTRACT: A comprehensive understanding of the uptake, tolerance and transport of heavy metals in the wetland system through aquatic plants will be essential for the development of phytoremediation technologies. Copper accumulation and translocation of a submersed macrophyte Hydrilla verticillata (L.f.) Royle were investigated. Plant shoots showed a significant accumulation of Cu with a maximum of 30830 mg Cu kg⁻¹ dry weight after exposed to 4000 μg L⁻¹ Cu for 4d. Both roots and shoots can directly take up Cu from solution and Cu mainly accumulated in cell wall fractions. Moreover, H. verticillata predominantly accumulated Cu through shoots from the aqueous solutions because of the higher weights and bioaccumulation factors of shoots than those of roots. Acropetal translocation of Cu in the plant is higher than the basipetal translocation, which implies that upward translocation of Cu is mainly via the xylem and downward translocation is mainly through the phloem. These findings contribute to the application of submerged aquatic plants to copper removal from moderately contaminated waters.
    Chemosphere 10/2010; 81(9):1098-103. · 3.14 Impact Factor

Publication Stats

19 Citations
6.27 Total Impact Points

Institutions

  • 2010
    • Northeast Institute of Geography and Agroecology
      • Institute of Urban Environment
      Beijing, Beijing Shi, China
    • Chinese Academy of Sciences
      • Laboratory of Environment and Health
      Peping, Beijing, China